The diprotonated 2,2‐(propane‐1,3‐di­yl)bis­(1,1,3,3‐tetra­methyl­guanidinium) cation: packing and conformational changes

Subject to packing with different anions, the title cation undergoes various conformational changes with significantly different N—C—C—C torsion angles, as well as different angles between the NCN₂ guanidine planes. The 2,2‐(propane‐1,3‐di­yl)bis­(1,1,3,3‐tetra­methyl­guanidinium) salts reported here, viz. the dibromide, C₁₃H₃₂N₆²⁺·2Br⁻, the tetra­phenyl­borate chloride, C₁₃H₃₂N₆²⁺·C₂₄H₂₀B⁻·Cl⁻, the tetra­chloro­mercurate, (C₁₃H₃₂N₆)HgCl₄], and the bis­(trifluoro­methanesulfonate), C₁₃H₃₂N₆²⁺·2CF₃SO₃⁻, are dominated by strong inter­molecular N—H⋯X hydrogen bonds, which form different packing patterns.